By K. Ohtake (auth.), Professor Tsuneo Someya (eds.)

ISBN-10: 4431682287

ISBN-13: 9784431682288

ISBN-10: 4431682309

ISBN-13: 9784431682301

Non-uniform combustion, as encountered in diesel and fuel turbine engines, furnaces, and boilers, is chargeable for the conversion of fossil gas to power and in addition for the corresponding formation of pollution. despite nice examine efforts some time past, the mechanism of non-uniform combustion has remained much less explored than that of different combustion forms, because it contains many, quite often temporary approaches which effect one another. In view of this historical past, a bunch study undertaking, "Exploration of Combustion Mechanism", was once proven to discover the mechanism of combustion, particularly that of diffusive combustion, and likewise to discover effective how one can keep watch over the combustion technique for greater usage of gas and the relief of pollutant emission. the crowd study was once began, after preparatory job of two years, in April 1988, for a interval of three years, as a venture with a Grant-in-Aid for medical study of precedence zone sponsored through the Ministry of schooling, technological know-how and tradition of Japan. the complete team of forty three participants was once arrange as an organizing committee of thirteen participants, and 5 examine teams, including 36 individuals. The learn teams have been: (1) regular combustion, (2) Unsteady spray combustion, (3) keep an eye on of combustion, (4) Chemistry of combustion, and (5) results of fuels. in the beginning of the venture it was once agreed that we should always pursue the mechanism of combustion from a systematic perspective, specifically, the objective of the venture used to be to acquire the basics, or "know why", instead of "know how" of combustion.

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The central axis of the flame is located at (JD = -5. The variation of velocity ratio within the range of 5 to 19 caused no appreciable change in the distance between the jet and central axis of the flame in this section. 17 gives the isotherm in the same transverse cross section. 2, a low temperature region is observed near the jet axis, which is likely to be caused by the flow of the unbumt fuel. 3, implying the complete consumption of the fuel. 2. = 54 20 m/S 10 5 0 '-" 0 -5 -10 -15 -20 -15 Fig.

2 5 0 VO o -5 -10 -15 -20 -15 Xc::) . 'I, -10 -5 0 1110 10 15 Fig. 2 temperature region is located below the jet axis. The formation of attached vortices is likely to result in the well-mixed region of the kidney shape in the wake of the flame where the chemical reaction proceeds very actively and consequently the flame temperature is rather high. It is also evident that the decrease in a velocity ratio makes the high temperature region move up to approach the axis of jet flame. 20 present the contours of isotherm, equi-concentration of CO, 02 and CO2 in terms of mole fraction in the transverse cross section at SID = 54.

3, implying the complete consumption of the fuel. 2. = 54 20 m/S 10 5 0 '-" 0 -5 -10 -15 -20 -15 Fig. 2 Effect of Surrounding Gas Motion on Turbulent Diffusion flames 21 15~--------~------~ ~ ID -15 Fig. = \10=54 10 C! 3 C! 20m/s = 18. 2 5 0 VO o -5 -10 -15 -20 -15 Xc::) . 'I, -10 -5 0 1110 10 15 Fig. 2 temperature region is located below the jet axis. The formation of attached vortices is likely to result in the well-mixed region of the kidney shape in the wake of the flame where the chemical reaction proceeds very actively and consequently the flame temperature is rather high.

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Advanced Combustion Science by K. Ohtake (auth.), Professor Tsuneo Someya (eds.)


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